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The average adult has about 21 square feet of skin.
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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.